Rocker arm assembly, compliance capsules, actuators, and support structures

Patent metadata

Field	Value
Publication number	US-12297754-B2
Application number	US-202117800001-A
Country	US
Kind code	B2
Filing date	Feb 19, 2021
Priority date	Feb 19, 2020
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

Several devices are disclosed that can be usable together or used in other valvetrains. Disclosed herein are a rocker arm assembly, compliance capsules for a switchable capsule of the rocker arm, actuators, and support structures for the actuators. The alternative compliance capsules can be electromechanically actuated by the alternative actuators, which are hung over the rocker shaft by the support structure. A cam actuator can be in addition to an overhead cam rail and in addition to the rocker shaft. The cam actuator can be configured with a compliance capsule so that the switching of the switchable capsule is mechanically linked and less reliant on precise electrical signal timing.

First claim

What is claimed is:

1. A compliance capsule for actuating a switchable capsule in a valvetrain system, comprising:
an outer tubular member defining a cavity and comprising a first end and a second end opposite to the first end;
a first body slidably disposed in the cavity adjacent the first end and connected to the switchable capsule to selectively transfer a motion to turn the switchable capsule on or off, wherein the first body comprises an internal cavity;
a second body at least partially and slidably disposed in the cavity adjacent the second end and configured to receive a force from an external source;
a compliance spring disposed between the first body and the second body; and
an inner capsule formed as an inner tubular member, the inner capsule comprising:
a first capsule end at least partially disposed inside the internal cavity of the first body; and
a second capsule end provided opposite the first capsule end and configured to receive the second body.

2. The compliance capsule of claim 1 , wherein the external source comprises a mechanical source configured to move the second body relative to the outer tubular member.

3. The compliance capsule of claim 2 , wherein the mechanical source comprises an actuation cam.

4. The compliance capsule of claim 1 , wherein the switchable capsule comprises a castellation device disposed in a rocker arm.

5. The compliance capsule of claim 1 , wherein the first body comprises a toothed rack disposed in the cavity between the first end of the outer tubular member and the second body, the toothed rack configured to actuate the switchable capsule.

6. The compliance capsule of claim 1 , wherein the first body and the switchable capsule are configured in a rack and pinion arrangement.

7. A valve actuating assembly comprising:
a rocker shaft;
a first rocker arm pivotably mounted around the rocker shaft;
a second rocker arm pivotably mounted around the rocker shaft;
a first valve lifting cam operably associated with the first rocker arm to impart a first valve lift profile to the first rocker arm and a second valve lifting cam operably associated with the second rocker arm to impart a second valve lift profile to the second rocker arm; and
a castellation device disposed in the second rocker arm and configured to selectively add the second valve lift profile to the first valve lift profile to actuate a valve.

8. The valve actuating assembly of claim 7 , wherein the first rocker arm comprises a target surface to receive force from the second rocker arm that corresponds to the second valve lift profile.

9. The valve actuating assembly of claim 8 , wherein the valve comprises an intake valve in a combustion engine, and wherein the intake valve is configured so that the first valve lift profile or the second valve lift profile imparts a late intake valve closing (LIVC) strategy.

10. The valve actuating assembly of claim 8 , wherein the valve comprises an intake valve in a combustion engine, and wherein the intake valve is configured so that the first valve lift profile or the second valve lift profile imparts one of an early intake valve closing (EIVC) strategy or a cylinder deactivation (CDA) strategy.

11. The valve actuating assembly of claim 8 , wherein the valve comprises an exhaust valve in a combustion engine, and wherein the exhaust valve is configured so that the first valve lift profile or the second valve lift profile imparts a late exhaust valve opening (LEVO) strategy.

12. The valve actuating assembly of claim 8 , wherein the valve comprises an exhaust valve in a combustion engine, and wherein the exhaust valve is configured so that the first valve lift profile or the second valve lift profile imparts one of an early exhaust valve opening (EEVO) strategy, a cylinder deactivation (CDA) strategy, or an engine braking (EB) strategy.

13. The valve actuating assembly of claim 7 , wherein the castellation device is switchable on and off and the castellation device is configured to absorb the second valve lift profile imparted by the second valve lifting cam when the castellation device switched off.

14. The valve actuating assembly of claim 13 , wherein the castellation device comprises:
a lash adjustment screw;
a first castellation member mounted on the lash adjustment screw; and
a second castellation member mounted on the lash adjustment screw and being rotatable relative to the first castellation member between an on-position, at which the castellation device is switched on, and an off-position, at which the castellation device is switched off,
wherein, when the second castellation member is in the on-position, motion exerted by the second valve lifting cam is transferred to the first rocker arm to add the second valve lift profile to the first valve lift profile, and
wherein, when the second castellation member is in the off-position, the motion exerted by the second valve lifting cam is absorbed in the castellation device and no second valve lift profile is transferred to the first rocker arm.

15. The valve actuating assembly of claim 14 , wherein, when the second castellation member is in the on-position, second teeth in the second castellation member align with first teeth in the first castellation member to transfer motion exerted by the second valve lifting cam to the first rocker arm to add the second valve lift profile, and wherein, when the second castellation member is in the off-position, the second teeth in the second castellation member align with first cavities in the first castellation member so that the castellation device absorbs the motion exerted by the second valve lifting cam, so that no second valve lift profile is transferred to the first rocker arm.

16. The valve actuating assembly of claim 14 , wherein the castellation device further comprises a bias spring configured bias the first castellation member and the second castellation member apart from each other.

17. The valve actuating assembly of claim 14 , further comprising the compliance capsule of claim 1 configured to rotate the second castellation member between the on-position and the off-position.

18. The valve actuating assembly of claim 17 , wherein the compliance capsule comprises a rack gear extendable in a direction substantially perpendicular to the rotating axis of the second castellation member, and wherein an exterior surface of the second castellation member comprises teeth for constituting a pinion gear.

19. The valve actuating assembly of claim 7 , wherein the castellation device is configured to selectively add the second valve lift profile to the first valve lift profile by transferring motion exerted by the second valve lifting cam to the first rocker arm.

Assignees

• Eaton Intelligent Power Ltd

Inventors

• Cecchi Michele Angelo
• Ravoni Marco
• Ciardullo Maria Letizia
• Dimaro Raffaele
• Andrisani Nicola

Classifications

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F01L2001/187

  Clips, e.g. for retaining rocker arm on pivot · CPC title

• F01L1/26

  characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder (with coaxial valves F01L1/28) · CPC title

• F01L1/182

  the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft · CPC title

• F01L2013/001

  Deactivating cylinders · CPC title